Air flow control



6. AKERs.

AIR FLOW CONTROL 7 Filed March 22, 1940 2 Sheets-Sheet 1 EIEIDDDDDPatentedMay 1941' a mary purpose'of the-"invention is'to providefa'con-Ybimetal strip I'l being one form that may be trol sensitive to andoperated by differences in employed. In this form, the outer end of thebiroom temperatures to. contr 1 the flow of air metal i1 is anchored toa post I8 fixed to the invention will become apparent to those, versedmade and the lever s6 proportioned as to lengths throughout. the severalviews in the drawings. In order to accomplish this result, the cover*slight passageway for admittance of air there- Then-a window 26 ofsuitable size is provided FLOW CONTROL Application ltfarch 22, 1940,Serial No. 325301 4Claims. (crass-ion This invention relates to meansfor controlling 'control'member that 'issensitive. to temperature theflow; of air in response to temperature changes. in that it willchange'formsubstanchanges such as in a duct leading from some heattially with but slight' changes in temperature. source such as -'aradiator or 'a-hot air furnace. Any suitable type of thermostaticcontrol may and the like or'fromi a cooling element. 'A pri- 5 beemployed, the herein shown helically coiled into that room in accordancewith those temperapartition 20 and has its inner end connected to turechanges. vA further important object of'the' ,10' a rockable shaft 19..invention is to provide astructure that will cause 0n the end of theshaft I9 is fixed a iever'2l. thecontrol to respond toqvery smallvariations- 1 A connecting rod, 22 is rockably secured to the intheroomtemperatures, all without requiring outer end of the lever-2| anddrops down to rockelaboratepr extremely delicate mechanisms. "ablyengage a lever 23 -which in turn is fix d o These and other objects andadvantages ofthe the damper shaft 1 IS, 'The connections are so in theart .in the following descriptioif of 1 one that'the damper l2 willberocked from-open to particular form of the invention as illustratedclosed positions as the bimetalmember l1 may more or lessdiagrammaticallylin theaccompanyexpand. I v ing'drawings, inwhich I a aSince the heat-sensitive member l|- -;is mount- 5 "Fig. 1 is a frontelevation of a structureemed in'the chamber in the end of the box II and.is, bodying the invention; I i thoroughly insulated and removed fromin-. Fig. 2, a transverse section onthe line 2- 2 in finance of thetemperature of mean flowing up Fig. 1; and f 7 l into and out ofthe boxll, means must be pro- Fig. 3, a vertical section on the line 3-3 in 25i ed t m ke th s ember 1 sp ns ve to Fig. 1. the room temperature ingeneral into which the Like characters or referenceindicate like parts 7air discharg from the box I I.

The usual air conductor or pipe I8 is herein grille 24 is confined tothe opening of the box shown as leading up to a header or outlet box II,and the end chamber in whichthe member ll, herein shown as mountedwithina partition I] is mounted is covered over by a solid cover wall to openthrough one side of the wall. A so that this control chamber is'closedto-- the cut-of! damper l2 in the nature of a-butterfly room from thefront. side. In order to insure valve is mounted to -be rocked by ashaft l3 circulation of the'roomair through this conextending'across theend of the pipe M; It is to trol, chamber to make the member l1responsive be noted that the damper I2 is notched out to thereto,-'acollector hood 25 is provided to extend clear an upturned hood ll, Fig.2, so that at the downwardly and outwardly from the floor of end of thebox ll there is always at least a the box H to be open from itsunderside only.

past regardless of whether or not the damper 40 through the partitionwall 15 and theinsulat- I2 is in the open or closed or any of theintering wall IBQ-Fig. 1, with the deflector hood l4 mediate positions.The box H is made. to be thereover open from itstop side only.- It is tov somewhat longer than it would be without my be noted that thecollector hood 25 is mounted control and in the present form is made toexto one side of the path of the. discharge air tend to one side beyondthe pipe III to have a from the box II and to be below that path, thevertical partition l5 extending transverse therehood 25 extending in'some cases under theacross, preferably well insulated by any suitabledischarging air, when a greater circulation is means such as bytheadditional insulating required through the thermostat chamber. wall l6.Now since there is alwaysan upward passage In the chamber thus providedin the box H of air to some degree past the end of the damper beyond thepartition 15, I provide a second parl2 across the hood I4 and outthrough the front tition 20 spaced from the first partition if: butgrille 24, a flow of air will be induced into the terminating by its topend below the top of the collector hood 25, through the control chamber,box II to leave an air passageway thereover. up across the thermostatl1, over the top of the On the partition 20, I mount a thermostaticpartition 20, down to and through the window 26 it is to be seen thatupward box, said damper and upwardly fromthe hood It to join with thecolumn of air flowing past that window. Thus the air within. the controlchamber does not become entrapped but is moving so as to make the airadjacent the control member I! correspond in temperature to the 1 air ofthe room being heated. The member I1 is thoroughly removed frominfluence of the temperature of the air in the box H by the down flowingcolumn of room air between the partitions i5 and 20 in addition to' theheat insulation afiorded by the wall l6 and the partition 20. It is tobe kept in mind that in general, there is always a circulation of air.

within the room when air is discharging from the box II and that thiscirculation takes a general travel and thence down around and back inpart of the room back to the underside of the incoming air so that thereis in general a cirof the room air toward the collector I1 is sodesigned a circulation manner across the lower damper l2 accordingly foradmission and closing off 01 the hot air flow.

employed without departing from the spirit of theinvention and I,therefore, do not desire to be limited to that precise form beyond thelimitations as maybe imposed by the following claims.

I claim:

1. For an air conductor, an outlet box having an intake opening, adamper mounted to swing to control flow of air through said opening intothe box, said damper being notched out to allow a limited flow or airpast a portion thereof regardless of position of the damper, a controlchamber at a side 01' said box adjacent said damper portion,

a damper operating thermostat in said chamber, means operativelyconnecting said damper and said thermostat for damper operation therebyresponsive to temperature changes at the thermostat, means forconducting air into said chamber from a zone to one side 01' said box,an upturned hood at the notch, and a passageway from said chamberdischarging through the hood into said box through the notch at saiddamper through and from said box particularly past said damper portioninduces a flow of air through said chamber. V

2. For an air conductor, an outlet box having an intake opening, controlflow of air through said opening into the being notched out to allow alimited flow or air past a portion thereof regardless of position of thedamper, a control chamber at a side of said box adjacent said damperportion, a damper operating thermostat in said chamber, meansoperatively connecting said damper and said thermostat for damperoperation thereby responsive to temperature portion, whereby flow of aira damper mounted to swing to changes at the thermostat, means forconducting air into said chamber from a from an end thereging passagewaybe! through said partition and hood. n8

3. For an air conductor, anoutletbox having the chamber inlet conduit.

box to the chamber box opening.

CECIL LYNN AKERs.

